[osg-users] Problem changing Stateset

[Enrico Villani]

Hello, I have a osg::Node* that has applied a osg::StateSet*  with many Attribute, in particular an osg::Material*.  When I try to switch the stateset to another, no changes are visible.

I tried with

node->setStateSet(TheOtherStateSet);

and

osg::stateSet* tmp = node.getOrCreateStateSet();
tmp = TheOtherStateSet;


but it doesn't work correctly.

Thank you Davide

[Thrall, Bryan]

Are you using display lists? Your first try should work to change the
state, but you won't see the effects unless you dirty the display list;
simply find all the Drawables under the node and call
dirtyDisplayList(), which will recompile the display list with the new
state.

If you are changing state more than once-in-a-while, you may want to
disable display lists instead (see Drawable::setUseDisplayList());
recompiling them all the time will slow things down (and is wasteful
anyway).

--
Bryan Thrall
FlightSafety International
Bryan....@flightsafety.com
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[Brian]

Hi,

I'm having a similar problem and was wondering how to "simply find all the Drawables?" I thought I knew, but after looking at the header files for a while, I'm not so sure.

Thanks,
Brian

[Robert Osfield]

On Nov 17, 2007 5:17 AM, Brian <bpd...@knology.net> wrote:
> Hi,
>
> I'm having a similar problem and was wondering how to "simply find all the Drawables?" I thought I knew, but after looking at the header files for a while, I'm not so sure.

NodeVisitor is your friend, there are plenty of examples of subclasses
from NodeVisitor in the OSG distribution itself, many of which go in
seach for Drawables. src/osgUtil/Optimizer.cpp in particular has
plenty of example to choose from.

Robert.